General bacterial porin family. General bacterial porins are a family of proteins from the outer membranes of Gram-negative bacteria. The porins act as molecular filters for hydrophilic compounds. They are responsible for the 'molecular sieve' properties of the outer membrane. Porins form large water-filled channels which allow the diffusion of hydrophilic molecules into the periplasmic space. Some porins form general diffusion channels that allow any solute up to a certain size to cross the membrane, while other porins are sp
Cystic fibrosis transmembrane conductance regulator (CFTR) is a membrane protein and chloride channel in vertebrates that is encoded by the CFTR gene. CFTR is an ABC transporter-class ion channel that codes for a protein that conducts chloride and thiocyanate ions across epithelial cell membranes.
Cystic fibrosis occurs because of mutations in the gene that makes a protein called CFTR (cystic fibrosis transmembrane regulator). A person with CF produces abnormal CFTR protein-or no CFTR protein at all, which causes the body to make thick, sticky mucus instead of the thin, watery kind.umans have 23 pairs of chromosomes in their DNA. The CF gene is found on chromosome number 7. It takes two copies of a CF gene-one inherited from each parent-for a child to show symptoms of CF. Persons born with only one CF gene (inherited from only one parent) and one normal gene are CF carriers.